set_base_fee_per_gas
Call v210 → current #0Manually sets the EIP-1559 base fee (admin only).
View calls on chainCall Workflow
This diagram shows the call execution flow: starting with set_base_fee_per_gas, passing through validation
(signature, nonce, mortality, fee payment), then pre-dispatch checks, followed by dispatch which emits events: NewBaseFeePerGas and modifies storage: BaseFeePerGas, and finally post-dispatch where ExtrinsicSuccess is emitted and fees are settled.
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Used by: developers
The Big Picture
Override automatic EIP-1559 calculation for emergencies or initialization.
Use Cases
- Emergency fee adjustment
- Initialize after upgrade
Input Parameters
| # | Name | Type | Description |
|---|---|---|---|
| 0 | fee | U256 | fee: 256-bit unsigned integer (Ethereum-style) |
Permissions
Origin
Unknown
Required Role
Permission data inferred from metadata. May be incomplete.
Requirements
- Admin/root privileges
- Valid U256 fee
Effects
Events Emitted
Storage Modified
Postconditions
- BaseFeePerGas updated
- NewBaseFeePerGas emitted
Side Effects
- Affects all subsequent transaction fees
Code Examples
// ----------------------------------------------------------------------
// HEADS UP: 1 arg below has a complex type with no usable default.
// Look for `undefined as any` and replace it with real value
// before running — the snippet compiles, but will fail at runtime as-is.
// ----------------------------------------------------------------------
import { createClient, Binary } from "polkadot-api";
import { getWsProvider } from "polkadot-api/ws";
import { sub } from "@polkadot-api/descriptors"; // generated by: npx papi add sub -w wss://entrypoint-finney.opentensor.ai:443
const client = createClient(getWsProvider("wss://entrypoint-finney.opentensor.ai:443"));
const api = client.getTypedApi(sub);
// Build set_base_fee_per_gas call (typed, named args)
const fee = undefined as any /* U256 — replace with real value */;
const tx = api.tx.BaseFee.set_base_fee_per_gas({
fee,
});Runtime Info
- Pallet Index
- 25
- Call Index
- 0
- First Version
- v210
- Current Version
- v411